Can a Project Billing Invoice be drawn from an AR Deposit (Commitment)?

I meant to interface a PA invoice amount to be reserved to a Commitment. In OM it seems like the commitment field is visible at the Pricing tab of the Order Lines, invoking the Menu: Folder > Show Field, and pick Commitment from the list. You can then pick from the list of values which will contain pre-existing Deposits and Guarantees that have already been created within Receivables, so then the autoinvoice automatically populates the reference_line_id in ra_interface_lines with the customer_trx_line_id of the commitment/deposit. Can we do the same in PA? Is there a Commitment field in PA during the